Electrical terminal prong with integral lug



Aug. 2, 1938. A. M. DRAVING ELECTRICAL TERMINAL PRONG WITH INTEGRAL LUGFiled Feb. 18, 1936 Patented .2, 1938 ELECTRICAL TERMINAL PRONG WITHINTEGRAL LUG Arthur M. Drawing, Philadelphia, Pa., assignor to Hugh H.Eby, Inc., Philadelphia, Pa.

Application February .18, 1936, Serial No. 64,481 I 2 Claiins. (Cl.173361) My invention relates to improvements in an electrical terminalprong with an integral lug,

and more particularly to a terminal prong with an integral lugJormed anddrawn from strip or sheet metal. Y

Heretofore electrical plug-in devices using a terminal prong incombination with a separate soldering lug have been found costly tomanufacture due to the assembly and riveting operations, also to thecost of the parts, and furthermore detective electrical connections haveresuited from poor riveting of the lug to the prong.

One object of my invention is to provide a tubular terminal prong andsoldering lug in one integral unit. I

A further object is to provide a tubular terminal prong with a lug ofuniform shape and maximum strength at low cost.

A further object is to provide a.tubular terminal prong with a lug madefrom sheet metal in one stamping and drawing operation.

A further purpose is to provide an abutment shoulder on the prongportion at its open end.

A further purpose is to provide a lateral onset of the sidewallextensions at the termination of the tubular prong's open end providingmeans for forming said sidewall extensions into a. soldering lug.

A further purpose is to provide sidewall extensions at the terminationof the tubular section of the prong to form means for rigidly fasteningthe prong and the lug to an insulating base member.

A further object is to provide an integral terminal prong and lug incombination with an electrical plug-in device. v

A still further purpose is to provide an insulat ing base havingsuitably formed apertures to receive and hold a drawn metal prong withan integral'lug.

have devised an improved construction and method of fabricating fromsheet metal an inte grai terminal prong and soldering lug, and my 5'invention lies in the structure and features hereinaiter described andclaimed.

Referring to the drawing:

Fig. 1 shows a metal strip with the ends tapered and punched to form anintegral soldering lug prior to drawing and forming operation.

- Fig. 2 shows a punch and a cross section thru a die for drawing andforming a tubular prong with an integral lug according to my invention.

Fig. 3 shows a ii-out elevation oi'the prong '55 and lug also showingone oi! the two iold seams With the foregoing and other objects in viewI in the body of the tubular prong, sidewall offsets from the abutmentshoulders, and the sidewall extensions to form the soldering lug.

Fig. 4 shows a top View of Fig. 3.

Fig. 5 shows a side elevation of Fig. 3.

Fig. 6 shows an aperture in an insulatingbase adapted to receive theprong sidewall extensions.

Fig. 7 shows a front elevation of a prong with sidewall extensionsinserted in an aperture, the' insulating base being shown in section.

Fig. 8 shows a view similar to Fig. 7, but after the sidewall extensionshave been folded in and pressed together, providing clamping means and asoldering lug. v

Fig. 9 is a top view of Fig. 8. Fig. 10 is a top view of an insulatingbase showing the integral lug of a prong after the assembly and clampingoperations.

' Fig. 11 is a side elevation of Fig. 10,

Referring to the drawing like numerals refer to like parts in thefigures where they appear.

To produce a tubular prong, seamed and with uniformly true sidewalls,having the same extended and providing means for forming a solderinglug, and also means for anchoring the prong with the lug unit in anapertured base, I

I provide a ductile strip or fiat sheet of metal of correct uniformwidth so that when the prongs are formed by the drawing and folding'method,

iii and it become seams i l and I iof the tubular body portion i2whenthe blank is forced into the cavity ii and the remaining portion ofthe blank is forced into the cavity it. being confined inside and out bypunch and die so that when the shoulder iii of the punch enters thecavity it of the die, the tapered end portions 22 of the blank arepressed outwardly and form the shoulder it, and

the parallel sidewall extensions it areiormed when the aforementionedshoulder it of the punch presses outwardly and down on the strip oisheet metal, seating the same on the shoulder it of the die. Thisshoulder may be formed at any .point intermediate the rounded closed endit and the ends of the sidewall extensions 23. By increasing thediameter of the die cavity 20 over that of the cavity 2! and employing ablank of uniform width as between points 25 of. the blank shown in Fig.1, an abutment shoulder i5 is formed. separating the sidewallextensions... it v with clearance space it between the same. Tapered endportions 22 of the blank shown in Fig. 1 are pierced at it and a commonlug is formed after mounting the prong on the insulating base, providingmeans for attaching a wire terminal 3 i as shown in Fig. 8. Aninsulating base it, Fig.

10, is apertured as shown in Fig. 6 thru which prong sidewall extensionpieces I are inserted as shown in Fig. 7. A portion of said extensionpieces It extends thru and past the top surface 25 of the aforesaid baseand after the abument shoulder i5 01 the tubular prong I2 is firmlyseated against the under side of the base projections 21 in theaperture, and the projecting portions of the said extension pieces M arethen folded over and pressed inwardly until both of aforesaid sidewallextensions are pressed together as at QL'fOIITLiHg a common solderinglug and also providing means for clamping the prong and lug unitsecurely in the aperture of the insulating base.

An aperture 28:: in an insulating base member 26 to receive and hold aprong with a lug member is shown in Fig. 6 in which 29 shows the edge ofsaid base, the aperture is generally circular in form, its diameterbeing slightly larger than the overall dimensions of the prong at theshoulder IS, the base projections?! extend inwardly from thecircumferential edge 28 of the aforesaid aperture providing means forpreventing turning of the prong with its integral lug and also providingmeans for seating the prong abutment shoulder l5 and for folding over ofthe sidewall e'x tensions H at 32, as previously stated.

Having thus set forth the nature of my invention, what I claim is:

1. In combination, a base member of insulating material having anaperture therethrough, the aperture being generally circular and thewall thereof being provided with apluralityj of inwardly extendingprojections, and a generally tubular terminal prong secured in saidaperture, the said prong having upwardly extending sidewall extensions,the diametral distance between the sidewall extensions being greaterthan the diameter of the prong proper and the projections in theaperture extending into the spaces between the said projections wherebythe prong is prevented from rotation.

2. A plug-in device comprising a base member having an aperturetherethrough, the wall of the aperture being provided with a pluralityof inwardly extending projections, aterminal prong.

aperture wall projections and the said lugs be-' ing so disposed in theaperture that the said projections are interposed between them, wherebythe prong is prevented from rotation.

ARTHUR M. DRAVING.

